TFW250-4 Alternator — Frame 280
TFW Series · TFW系列发电机
The TFW250-4 is a 250 kW / 312.5 kVA 3-phase 4-wire alternator from Zhiqiang's TFW series. It runs at 400 V / 50 Hz with H-class insulation and IP21 protection, and is factory-matched to Yuchai diesel engines for genset applications.
We wind the stator and rotor of every TFW machine in our own workshop in Luchuan, so the insulation class, the copper fill and the voltage regulation are set by us rather than bought in with a third-party alternator. Voltage is held to ±1% on this frame, and the IP21 enclosure keeps dust and water spray away from the windings on humid, coastal sites.
If you are unsure whether this frame is the right match, send us the load and the site conditions and we will confirm it — or the next size up if you need a safer margin for motor starting. Sizing advice is free before you order, and the kW to kVA sizing guide shows the arithmetic we use.
Specifications
| Model | TFW250-4 |
|---|---|
| Series | TFW Series |
| Frame Size | 280 |
| Prime Power | 250 kW / 312.5 kVA |
| Rated Voltage | 400 V |
| Rated Current | 453 A |
| Frequency | 50 Hz |
| Rated Speed | 1500 RPM |
| Power Factor | 0.8 |
| Voltage Regulation | ±1% |
| Insulation Class | H |
| Protection Class | IP21 |
| Excitation | Brushless self-excited |
| Phase | 3-phase 4-wire |
| Weight | 640 kg |
Gensets Using This Alternator
The TFW250-4 is installed in the following generator sets:
Frequently Asked Questions
What is the prime rating of the TFW250-4 alternator?▼
312.5 kVA / 250 kW at 50 Hz and 1500 rpm, power factor 0.8, rated 400 V and 453 A. That is the continuous (prime) figure. Confirm the duty before ordering: a standby set is loaded to the engine's standby rating instead, and the frame must match whichever duty you buy.
Which generator sets are built with the TFW250-4?▼
In our current catalogue, the TFW250-4 is fitted to TFW-250. It is wound to order for other engine and speed combinations as well, so tell us the engine, the speed and the mounting and we will quote the same frame for your build.
What insulation and protection class does the TFW250-4 use?▼
Class H insulation with IP21 protection, weighing 640 kg on frame 280. The higher insulation class tolerates a bigger temperature rise without shortening life, which is the point in a tropical plant room where ambient air sits near 40°C for months at a time.
Get a technical quotation for your project
Send your load, country and frequency requirements — an engineer will confirm configuration, pricing and shipping.